Safety Precautions: 1. Please put onthin shirt or sweater when using this product, to avoid the product immediate contact with your skin. 2. Because of the difference each personal and physical, please stop using when pruritus which belongs to temporary reaction, and please do not scratching the itch. 3. Please do not use one hour after dinner. 4. Please do not use when sleeping. 5. Please do not disassemble or transform this products. 6. Please do not use in bathroom or other anywhere moist, and keep it in the dry place. 7. Please wipe with wet tissue when when it is dirty, and use when dry. 8. Please do not use long time continuously. ( Advice to use twice per day, interval time for times should be 2-3 hours) 9. Please use this products with dedicated power adapter, and take out the attaching plug after using to ensure the safety. 10. Pregnant women do not use 11. Children should use under the care of adult.